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I have learned the Ethereum yellow paper. In the 4th page of the paper, you can find the following statements:

Ethereum Yellow Paper Page 4 The function, L_s of sigma is defined as p of a, and the function is used to provide a short identity. I wonder whether if L_s is a function which outputs some value (a hash) or a set of tuples of p(a) like in the picture?

What is the collapse function? And how do I understand the function L_s?

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The collapse function returns a set of tuples, each representing the following: the hash of an address A (first component), followed by the serialization of the state of that address, i.e., the Recursive Length Prefix (RLP) of that A's nonce, balance, storage, and code hash.

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